THE FRIB SC-LINAC: INSTALLATION AND PHASED COMMISSIONING*

The Facility for Rare Isotope Beams (FRIB) superconducting (SC) radio-frequency (RF) driver linac is designed to accelerate all stable ions, including uranium, to energies above 200 MeV/u. The linac includes 46 cryomodules (CMs) containing 104 quarter-wave resonators (QWRs) and 220 half-wave resonators (HWRs). With the newly-commissioned refrigeration system supplying liquid helium to the QWR and SC solenoids, heavy ion beams including Ne, Ar, Kr, and Xe were accelerated to > 20 MeV/u in the first linac segment (LS1), using 15 CMs containing 104 QWRs (β = 0.041 and 0.085) and 39 solenoids. Even at this intermediate stage, the FRIB accelerator has already become the world’s highest-energy continuous-wave (CW) hadron linac [1]. Installation of HWR CMs (β = 0.29 and 0.53) is proceeding in parallel. Development of β = 0.65 elliptical resonators is on-going to support an energy upgrade to 400 MeV/u. This paper summarizes the FRIB SC-linac installation and phased commissioning status that is on schedule and on budget.

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